The Enigma of Orbital Angular Momentum of Spatiotemporal Vortex Pulses
The Enigma of Orbital Angular Momentum of Spatiotemporal Vortex Pulses
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时空涡旋脉冲轨道角动量之谜
DOI:
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
K. Bliokh
中科院分区:
文献类型:
--
作者:
K. Bliokh
Motivated by the progress in generation of optical spatiotemporal vortex pulses (STVPs), there is a theoretical discussion about the value of the transverse orbital angular momentum (OAM) carried by such pulses. Two recent works [K. Y. Bliokh, Phys. Rev. Lett. 126, 243601 (2021)] and [S. W. Hancock et al. , Phys. Rev. Lett. 127, 193901 (2021)] claimed the OAM values which differ by a factor of 2 for circular STVPs. Here we resolve this controversy by showing that the result by Hancock et al. is correct for the total OAM, while the result by Bliokh describes the suitably defined intrinsic part of the OAM. The other, extrinsic part of the OAM originates from the fact that plane waves of the same amplitude but different frequencies in the pulse spectrum contain different densities of photons, which induces a transverse vortex-dependent shift of the photon centroid even in a STVP with symmetric intensity (energy-density) distribution. We describe similar peculiarities of the OAM of acoustic and relativistic quantum-mechanical (Klein-Gordon and arbitrary-spin) STVPs. In all cases, only the intrinsic OAM keeps a universal lucid form independent of the details of the problem and similar to the OAM of monochromatic vortex beams.
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影响因子:
8.6
作者:
Bliokh, Konstantin Yu.;Bliokh, Yury P.;Nori, Franco
通讯作者:
Nori, Franco
影响因子:
3.3
作者:
Afanasev, Andrei;Carlson, Carl E.;Solyanik, Maria
通讯作者:
Solyanik, Maria
影响因子:
44.1
作者:
Lloyd, S. M.;Babiker, M.;Yuan, J.
通讯作者:
Yuan, J.
影响因子:
10.4
作者:
Hancock, S. W.;Zahedpour, S.;Milchberg, H. M.
通讯作者:
Milchberg, H. M.